different between unnapped vs unmapped

English

un- +? napped

unnapped (not comparable)

Finished without a nap.
- 1952, Louis C. McCabe, Air Pollution: Proceedings, page 284:
  Napping permits a more permeable cake on the fabric surface but, in some cases, is more difficult to clean than unnapped cloth.

From un- +? mapped.

unmapped (comparative more unmapped, superlative most unmapped)

Not mapped.
- 1978, Lawrence Durrell, Livia, Faber & Faber 1992 (Avignon Quintet), p. 327:
  His objective then was archaeology, his hero Evans, and his heart he had set upon exploring the labyrinth at Gortymna which remains unmapped to this day because of its great extent.

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